The specific heat of water is 4190 j/(kg*k). suppose you put 1 kg of water (a bit over 4 cups) into a microwave that can deliver 1000 w of power to the water when it is running at full power. roughly how long will you need to run the microwave at full power in order to raise the temperature of the water by 10°c?

To find the initial velocity of the bike rider, we can use the kinematic equation: vf = vi + at. Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity.

To find the initial velocity of the bike rider, we can use the kinematic equation:
vf = vi + at

Given that the final velocity is 7.5 m/s, the time is 4.5 s, and the displacement is 19 m, we can rearrange the equation to solve for the initial velocity:

vi = vf - at

Substituting the given values, we get:
vi = 7.5 m/s - a * 4.5 s

Since the bike rider is pedaling with constant acceleration, we can assume that the displacement is given by:
d = vi * t + 0.5 * a * t^2

Substituting the given values, we get:
19 m = vi * 4.5 s + 0.5 * a * (4.5 s)^2

From these two equations, we have a system of equations that can be solved to find the initial velocity.

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To find the initial velocity of the bike with constant acceleration, we use kinematic equations that incorporate the given final velocity, acceleration time, and displacement. We calculate the acceleration first, and then solve for the initial velocity.

Finding the Initial Velocity of the Bike

To determine the initial velocity of the bike, we can use the kinematic equation that relates initial velocity, final velocity, acceleration, displacement, and time:

vf = vi + at
d = vi*t + (1/2)at²

Given that the final velocity (vf) is 7.5 m/s, acceleration time (t) is 4.5 s, and displacement (d) is 19 m, we can solve for initial velocity (vi). Using the second equation, we rearrange to solve for vi:

vi = (d - (1/2)at²) / t

We know the displacement and time, but we need to find acceleration (a) first. We use the first equation to find acceleration:

7.5 m/s = vi + a(4.5 s)

Since we don't have vi yet, we use this equation after finding acceleration with the displacement:

19 m = vi(4.5 s) + (1/2)a(4.5 s)�

From the above information, we can calculate acceleration. We'll then use that to find the initial velocity. With these calculations, the student will understand the steps to find the initial velocity of a bike when given its final velocity, acceleration time, and displacement.

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The answer is B. Perfect.

A carbon atom and an oxygen atom share four electrons in a double covalent bond in a molecule of carbon dioxide to achieve stability.

The carbon and oxygen atoms share electrons through covalent bonding, which is a type of chemical bond where atoms share pairs of electrons. In the case of carbon dioxide (O=C=O), a molecule consisting of a single carbon atom and two oxygen atoms, there are two double covalent bonds to achieve stability. Each double bond involves the sharing of two pairs of electrons (four electrons in total) between the carbon and oxygen atoms. Hence, this indicates that a carbon atom and an oxygen atom share four electrons in a double covalent bond.

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Answer:

-2065

Explanation:

155 g of ammonia (NH3) to moles:

155 g / 17 g/mol = 9.118

Given: The ratio includes 4 moles of ammonia and -906 kJ of energy.

Therefore, to find the heat, multiply the moles of ammonia by ratio of energy to moles in the formula.

[tex]9.118*\frac{-906}{4} =-2065.2[/tex]

OR

[tex]-2.06*10x^{3}[/tex]

To calculate the heat associated with the complete reaction of 155 g of NH3, convert the mass of NH3 to moles, use stoichiometric coefficients to calculate the number of moles of heat produced, and calculate the heat associated with the reaction.

To calculate the heat associated with the complete reaction of 155 g of NH3, we need to first convert the mass of NH3 to moles:

Molar mass of NH3 (1 mol of N + 3 mol of H) = 14.01 g/mol + 1.01 g/mol * 3 = 17.03 g/mol

Number of moles of NH3 = 155 g / 17.03 g/mol = 9.11 mol

Next, we use the stoichiometric coefficients in the balanced equation to calculate the number of moles of heat produced:

From the balanced equation, we see that 4 moles of NH3 produce 6 moles of H2O and release -906 kJ of heat.

So, 9.11 moles of NH3 produce (9.11 mol * 6 mol H2O / 4 mol NH3) = 13.665 mol H2O.

Finally, we calculate the heat associated with the complete reaction of 155 g of NH3:

Heat = (13.665 mol H2O * -906 kJ / 6 mol H2O) = -2048.05 kJ.

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The term names the other main method of reproduction is :  (B). Fusion

Reproduction can be defined as the act of producing off springs by a parent organism either by different means.

Reproduction is very important because it is the only means a species existence can continue and also it is the  only way a race will not go extinct.

In conclusion, The term names the other main method of reproduction is Fusion

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The light pulse that will reach you first is: (C). the two light pulses will reach you at the same time.

Light according to physics can be defined as electromagnetic radiations that are visible to the eyes. Light speed in a vacuum is always constant and currently the speed of light in air is 3 * [tex]10^{8}[/tex] m/s

A light pulse is defined as an optical pulse of flashes of light.

In conclusion, The light pulse that will reach you first is the two light pulses will reach you at the same time, since the light was sent at the same distance.

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Answer:

A) avoid lifting above shoulder.

Explanation:

 the correct option will be option A) avoid lifting above shoulder.

So,

For safe lifting one should not lift above shoulder level.

Safe lifting is one of the most important practice which should be encountered. Because of this many workers have suffer from injuries, permanent deformation of  the  body of the worker.

So, for practicing safe lifting is very important.

Final answer:

The correct option is (b) the wavelength of the waves. Adele can differentiate between colors based on the wavelength of light waves. Color perception is linked to light's wavelength, with blue having shorter wavelengths, and red longer wavelengths. Therefore, wavelength is key in distinguishing between colors.

Explanation:

Adele is able to differentiate between the colors yellow, green, and blue in her room because of the wavelength of the light waves. Light that is visible to humans makes up only a small portion of the electromagnetic spectrum, and within this spectrum, color perception is directly linked to wavelength.

Longer wavelengths are associated with the color red, intermediate wavelengths with green, and shorter wavelengths with blue and violet colors. This explains why Adele perceives different colors, as each hue represents light of a specific range of wavelengths.

Thus, the correct answer to what light wave attribute allows Adele to differentiate between these colors is b. the wavelength of the waves.

When organizing colors by wavelength, from shortest to longest, it goes from blue to yellow to red. Conversely, when arranging according to frequency, which is inversely related to wavelength, the order is red (lowest frequency), yellow, and then blue (highest frequency).

This demonstrates the inverse relationship between wavelength and frequency in the electromagnetic spectrum.

Answer:

5m

Explanation:

The acceleration of the swimmer is 3.57 meters per second squared, calculated by dividing the force (250 N) by the swimmer's mass (70 kg) using Newton's second law.

To calculate the acceleration of the 70-kg swimmer who pushes off the pool wall with a force of 250 N, we use Newton's second law of motion, which is stated as F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. To find the acceleration, we rearrange the formula to a = F / m.

Therefore, the acceleration a of the swimmer can be calculated by dividing the force by the mass of the swimmer:

a = F / m = 250 N / 70 kg = 3.57 m/s2

This means the swimmer's acceleration is 3.57 meters per second squared.

Positively charged ions are surrounded by freely moving electrons in metallic bonding.

Minerals containing transition metals exhibit metallic bonding frequently. Minerals with metallic bonding include gold, silver, and copper.

Metallically bound compounds are efficient heat and electricity conductors because valence electrons can travel freely throughout the structure.

When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created.

Positively charged ions are encircled by an electron cloud during metallic bonding. The nucleus of an atom is not strongly bound to outer-level electrons. Instead, the electrons freely move among many positively charged ions.

Thus, The positively charged ions are surrounded by freely moving electrons in metallic bonding.

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According to the definition of mechanical work, the pushing on a rock accomplishes no work done unless there is a movement in the same direction as the direction of the force.

Mechanical work is the amount of energy which is transferred by a force that is applied on the object. Like that of other energies, it is a scalar quantity, with the SI units of joules. The heat conduction is not considered to be a form of work done, since there is no macroscopically measurable force, only microscopic forces occurring in atomic collisions.

According to the definition of mechanical work, the pushing on a rock accomplishes no work unless there is a movement in the same direction as that of the direction of the force applied.

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The magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole is 76.6 N.

To find the kinetic frictional force, we first need to calculate the work done by friction during the fireman's slide. This can be found using the work-energy principle, where the work done equals the change in kinetic energy. The kinetic energy just before landing is given by (1/2)mv2, where m is the mass (86 kg) and v is the velocity (1.4 m/s). The potential energy lost during the descent is mgh, where g is the acceleration due to gravity (9.8 m/s2) and h is the distance (4.0 m). The work done by friction is the difference between the initial potential energy and final kinetic energy. Solving these gives the frictional force as the work done by friction divided by the distance traveled down the pole.

The formula for this law is P1/T1 = P2/T2. Temperatures must always be expressed in kelvins when using gas laws.

Gay-Lussac's Law, also known as Amontons' law, states that the pressure of a gas is directly proportional to its absolute temperature, provided that the volume and amount of gas remain constant. The mathematical expression for Gay-Lussac's Law is:

P1/T1 = P2/T2

where P1 and P2 are the initial and final pressures, and T1 and T2 are the initial and final absolute temperatures (in Kelvin). This means that if the temperature of a gas increases, its pressure also increases, as long as the volume does not change.

For example, if a gas in a sealed container is heated from 300 K to 600 K, its pressure will double assuming the volume of the container remains constant.

It is important to note that temperatures must always be expressed in kelvins when using gas laws. Gay-Lussac's Law is similar to Charles's Law but focuses on the relationship between temperature and pressure instead of temperature and volume.

The weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons, as we know that the value of the acceleration due to the gravity of the earth would be 1.47 Newtons .

It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another .

As given in the problem we have to find out how much a 0.15 kg baseball weighs on earth .

The value of the acceleration due to gravity on the earth = 9.8 m / s²

The weight of the baseball on the earth = 0.15 × 9.8

                                                                   = 1.47 Newtons

Thus, the weight of the 0.15 - kilogram baseball on the earth would be 1.47 Newtons .

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Answer: Plato users - B.  radio telescope

Explanation:  just took test

The x-component of the total momentum of Bryce's mice is approximately -0.01299 kg⋅m/s, and the y-component is approximately -0.12702 kg⋅m/s.

Calculate the momentum of each mouse:

The momentum (p) of an object is given by the product of its mass (m) and velocity (v):

For the first mouse:

p1 = (0.0227 kg) × (0.517 m/s) = 0.0117439 kg⋅m/s in the x-direction, and

p1 = (0.0227 kg) × (-0.493 m/s) = -0.0112261 kg⋅m/s in the y-direction.

Sum up the momenta for each direction:

For the x-component:

px = p1x + p2x + p3x + p4x

px = (0.0117439 kg⋅m/s) + (-0.0121411 kg⋅m/s) + (0.0077545 kg⋅m/s) + (-0.0203475 kg⋅m/s)

px ≈ -0.01299 kg⋅m/s

Calculate the final values:

For the y-component:

py = p1y + p2y + p3y + p4y

py = (-0.0112261 kg⋅m/s) + (-0.0182619 kg⋅m/s) + (0.0102783 kg⋅m/s) + (0.022034 kg⋅m/s)

py ≈ -0.12702 kg⋅m/s

The average speed of the doctor is 75 km per hour and his average velocity should be zero.

Given that,

Based on the above information, the calculation is as follows:

We know that

[tex]Speed = \frac{Distance}{Time}\\\\= \frac{75}{1}[/tex]

= 75 km per hour

Therefore we can conclude that the average speed of the doctor is 75 km per hour and his average velocity should be zero.

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The Temperature in Chattanooga, Tennessee is -3 °C, then the temperature in Sam's hometown will be equal to -21 °C.

A temperature is a unit of hotness or coldness that can be described in terms of a variety of arbitrary scales. It also indicates the direction in which thermal energy will naturally flow, i.e., from a hotter body to a region of lower temperature.

Temperature is not the same as the energy of the thermodynamic system; for instance, an iceberg has considerably higher heat than a burning match, but it has a far larger total heat energy than a match.

As opposed to extensive qualities like mass or volume, which are reliant on the amount of stuff being studied, the temperature is an intensive attribute, just like pressure or density.

As per the given information in the question,

The temperature in Chattanooga, Tennessee = -3 °C

The temperature in Sam’s hometown is 18° colder than that.

Then, the temperature in his hometown will be,

= -3 - 18

= -21 °C.

Therefore, the temperature in the hometown will be -21 °C.

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When a ball is thrown straight up, its velocity changes from positive to negative, while its acceleration changes from negative to zero to positive.

When a ball is thrown straight up into the air, the velocity of the ball changes. Initially, the ball has a positive velocity, representing upward motion. As it moves against the force of gravity, the velocity decreases until it reaches zero at the highest point of its trajectory. Then, as the ball falls back down, the velocity becomes negative, increasing in magnitude as it approaches the ground.

The acceleration of the ball also changes during its motion. In the upward direction, the acceleration is negative, as it opposes the ball's initial velocity. At the highest point, the acceleration is zero, as the ball momentarily stops moving vertically. On the downward path, the acceleration is positive, as it adds to the ball's velocity, increasing its speed as it falls back down.

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you can press now lol